Enviro EA800 owner manual Relay Operation

			General Information
Table 11	Sensor Parameter Descriptions — continued
Parameter		Applicable to Sensors	Description
High Alarm		• Blue, Red and White	The High Alarm Limit sets the value that trips the high alarm when
Limit		temperature sensors	exceeded.
		• HA-III+
		• 4-20mA sensor
		• Wireless humidity
		sensor
		• Wireless
		temperature sensor
Alarm Delay		All	This sets the time period that an alarm condition can exist before the
Time			alarm is triggered. This is useful for helping to prevent false alarms from
			occurring in situations where normal activities cause conditions to tem-
			porarily exceed alarm thresholds. For example, the temperature in a
			freezer may temporarily rise above the High alarm limit while frozen food
			is being restocked and the freezer door is open, but the delay prevents
			the alarm from going off unless the temperature fails to cool below the
			alarm threshold within the alarm delay period.

Relay Operation

This section describes the operation of the base unit's relays. The relays must be programmed correctly so that their outputs provide the desired signaling to the alarm panel.

Table 12 Relay Configuration Settings

Relay Setting Description

No Alarm	No Alarm: Power is removed from the relay coil as shown below.
Relay State:				To
De-Energized (default)			NC
				alarm
		C		panel
			NO

Idc = 0

From

EA800

logic

Alarm: Power is applied to the relay coil as shown below.

NC	To
	alarm
C
	panel
NO
Idc
From
EA800
logic

No Alarm	No Alarm: Power is applied to the relay coil as shown below.
Relay State: Energized					To
				NC
					alarm
			C
					panel
				NO
	From	Idc
	EA800
	logic
	Alarm: Power is removed from the relay coil as shown below. This provides for a
	default alarm if the EA800 loses power in addition to the sensors' alarms.
					To
				NC
			C		alarm
					panel
				NO
	From	Idc = 0
	EA800
	logic
Active Condition:	Sets the alarm to be active when an alarm condition exists.
Alarm Only
Active Condition:	Sets the alarm to be active when an alarm condition exists or a warning is active.
Alarm or Warning (default)

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